// Copyright (C) 2025 Kumo inc.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

#ifndef ROTHAR_PEGTL_CONTRIB_INTERNAL_PEEK_UINT_HPP
#define ROTHAR_PEGTL_CONTRIB_INTERNAL_PEEK_UINT_HPP

#include <cstddef>
#include <cstdint>

#include "../../config.hpp"
#include "../../internal/input_pair.hpp"

#include "read_uint.hpp"

namespace rothar::internal
{
   template< typename R >
   struct peek_uint_impl
   {
      using data_t = typename R::type;
      using pair_t = input_pair< data_t >;

      template< typename ParseInput >
      [[nodiscard]] static pair_t peek( ParseInput& in ) noexcept( noexcept( in.size( sizeof( data_t ) ) ) )
      {
         if( in.size( sizeof( data_t ) ) < sizeof( data_t ) ) {
            return { 0, 0 };
         }
         const data_t data = R::read( in.current() );
         return { data, sizeof( data_t ) };
      }
   };

   using peek_uint16_be = peek_uint_impl< read_uint16_be >;
   using peek_uint16_le = peek_uint_impl< read_uint16_le >;

   using peek_uint32_be = peek_uint_impl< read_uint32_be >;
   using peek_uint32_le = peek_uint_impl< read_uint32_le >;

   using peek_uint64_be = peek_uint_impl< read_uint64_be >;
   using peek_uint64_le = peek_uint_impl< read_uint64_le >;

}  // namespace rothar::internal

#endif
